Machine for molding building tiles



May 18 1926.

- L. R. cor-'FIN MACHINE FOR MOLDING BUILDING TILES Filed Jan. 2, 1924 g4 sheetsheet l @M im@ May 1s 192s. 1,584,849

L. R. COFFIN MACHINE FOR MOLDING BUILDING TILES Filed Jan. 2, 1924 2 sheetssheet 2 fw '3g 37 Patented May 18, 1926.

UNIrI-:nsraras LESLIE R. COFFIN, OF LOS ANGELES, CALIFORNIA.

MACHINE FOB MOLDING BUILDING TILES..

due to the adhesion of the material used tov the cores. A great loss in efficiency results from the methods heretofore used because of the breaking andjdamaging of tiles or blocks during the process of removal of the cores therefromv and in the removing4 of the tiles or blocks' from thel machine. Wooden ycores were first usedv in this art, and proved very unsatisfactory. Aluminum cores then'replaced the wooden cores, and while this invention relates to a. machine employing aluminum cores or cores of metallic `alloys thatresemble aluminum, the use of aluminum` cores is not claimedas a part of the invention.

An object of this invention is to pro-` vide a machine employing cores of aluminum or metallic alloys resembling aluminum invwhich the cores may be easily and efficiently removed from the blocks without damaging the blocks. f

An object-- of this vinvention is to provide a machine in which the moldingcores are held rigidly and the molded tiles or blocks moved from engagement therewith.

An object of this invention is to provide a mechanism wherein the maximum withdrawal force is applied at the startof the withdrawal of blocks fromthe cores.

`An object of this invention is to provide a mechanism wherein the force applied to remove the ytile from the cores diminishes as the tiles proceed from the cores.

An object of this inventionis to provide a machine for molding a multiplicity of fireproof building blocks in one operation, said tiles to be separately'disposedin the machine and easily removable therefrom.

An object of this invention is to provide a machine having the above enumerated advantages that is manually operated and requires a minimum of labor.

Other objects and advantages will be ap parent from the following detailed descripfireproof wall tiles Application led January 2., 1924. Serial No. 683,955.

tion of a preferred embodiment lof this invention, of which the accompanying drawtaken substantially on the line 3 3 of Figure 1, showing the gypsum blocks as molded in this machine, illustratinga construction of the pivoted side plates.

Fig. 4 is a side elevation partly in section illustrating the fastening and position of the cores.

Fig. 5 is a sectional side view showing the construction of the car guide plates embodied in this invention.

Fig. 6 is a view taken substantially on line 6 6 of Figure 2, showing the car guides. y

In the drawing, 1 generally indicates the frame of the car, which has channel iron supports 2. Bearings 4 are `fixed to the .channel irons 2 and are adapted to carry the axle 6 to which the wheels '7 are journaled. 8 illustrates frame membersextending rearwardly7 to which an axle S) isjournaled in suitable bearings lO supporting a rear wheel 11. rlhe wheels 7 and 11 are positioned to run on the tracks 12 vwhich arerigidly connected by cross members 13, rigidly secured by the angle irons 14.

The back plate 15 is secured to the tracks 12, as shown at 16, and is held in vertical po sition by the reinforcing members 17. Tapered aluminum cores 18 are bolted to the back plate by bolts 19. The bolt holes 20 are of greater diameter than the bolts 19 to Ial low the cores to be adjusted in their correct position on the back plate 15.

A shaft 22 is journaled in suitable bearings in the reinforcing members 17. Keyed to the said shaft are the eccentric wheels 23 having diverging arms 24 cast to the said wheels 23 and forming an eccentric rod shoulder 25, having an arm hole 26 through which an eccentric rod 27 projects; the length of the rod 27 is regulated by means of the nuts 28 which are screwed on the rod as `shown in Figure 2 of the drawings.

On 4the other end of the rods 27 are eccentric arm grips 29 adapted tov fit closely a.

square rod 30, which rod 30 runs transversely through the wheeled car.

The. rod 30 is secured in the car side plate 31 and .projects from each side thereof to be engaged by eccentric arm grips 29.

rlhe eccentric rod 27 is made adjustable in length so as to establish the greatest torque exerted to move the car from the back plate at the start of the rearward motion ot the car. The above mentioned torque is produced by exerting a force on eccentric actuating arms 3;, which arms 32 are rigidly secured to the eccentric wheels 3 as shown at 33.

Arms 50 are secured to the eccentric wheels 23 so that when the eccentric actuating arms 32 are pushed down and have moved the car away from the back plate 15, the shoulders 51 of the arms 50 engage the eccentric rods 27 and lift the jaws Q9 from engagement with the rod 30.

Secured to the car trame 1 is the car base plate 34, and car side plates 31, to which side plates 31 a top plate 35 is hinged or otherwise secured.

Pivoted on shafts 36 are block side plates 37; transverse spacing plates 38 are riveted to the plates 37. A plate 39 located approximately on the center of the -car is rigidly secured to the car and provided with a pair of transverse spacing members 40.

Securely riveted to the back plate 15 are curved angle iron plates 41 which form guideways and clamps to position the mold walls formeel by the members 37 and 38.

4Securely riveted to the plate 15, positioned so as to engage the frame of the car, are angle guides 49, said guides 43 to extend further to the rear than the plates 41 to correctly position and square the carin relation to the back plate 15 before the angle plates t1 clamp the members 37 in position.

The operation of this preferred embodiment of my invention is The car is run forward on the tracks 12 to a position that allows the eccentric arm aws 29 to engage the square r-od 30 at each end of the said rod 30. The eccentric actuating arm is then pushed downward forcing the car forward to engage the guides 43, which results in correct-ly positioning the car on the track in relation to the back plate 15. The end side plates 37 then engage the curved angle iron plates 41, which plates 41 have a cam action, forcing the plates 37 together and locking the same in their correct position in relation to the cores.

The machine is then in position for the molding of the blocks. A hopper containing lireproof material (preferably gypsum) is then run over the machine above the cores and the material poured around the cores in the spaces formed by the side plates 37, the plates 3S and the back plate 15. The mold-- ing material is then allowed to set. After the blocks have hardened the eccentric actuating arms are forced upward, which results in pushing the car back, disengaging the blocks from t-he cores. The blocks having been released from their bond with the cores, it is an easy matter to push the cars turther backward to completely more the blocks from the cores.

The pivoted side plates areA then pushed to the side, which action results in releasing the blocks from their bond with the said side plates 37. The blocks are then picked 'from the -niachine and taken to a drying chamber or exposed to the drying a tion ot the sun. The machine is then ready to mold another set of blocks.

I prefer to treat the plates 37, 33, back plate 15, and the cores with a mixture of kerosene and parailin prior to this molding, as this treatment allows a quicker' and more etlicient removal of the molded blocks from the machine.

Having fully described a preferred embodiment or' this invention and the use thereof, it is to be understood that I do not wish to limit myself to the construction disclosed, which may be varied in detail without departing from the spirit of the invention as pointed out in the following claims.

I claim 1. In a machine for molding building blocks, the combination of a car, comprising pivotal members forming molding zones, a stationary plate, cores secured to the stationary plate, and guide members secured to said stationary plate, guiding said car into engagement with said plate.

2. In a machine for molding building blocks, the combination of a car running on a track, said car comprising molding zones having pivotal sides, a stationary plate, and means engaging the car with the plate.

3. In a machine for molding building blocks, the combination ot a car comprising pivotal members forming molding zones, a stationary plate, cores secured to the stationary plate, means to force said car to engage said plate, and guide members clamping said pivotal members in rigid contact.

4. In a machine for molding building blocks, the combination ot a ear, comprising pivotal members forming molding zones, and a stationary plate member secured to t'acks on which said car is adapted to run.

5. In a machine for molding building blocks, the combination of a car, comprising side members, pivotal members forming molding zones, a rod secured to said side members, a stationary plate to which cores are secured, members reinforcing the stationary plate, a shaft journaled in the reinforcing members, eccentric. wheels secured to said shaft, adjustable eccentric arms secured at one end to said wheels, jaws on the other' end of said arms adapted to engage said rod, and means to rotate said eccentric wheels to orce said car to engage the stationary plate.

6. In a machine for molding building blocks, the combination of means to support a plurality of sets of cores, and a plurality of pivoted side plates pivoted outwardly from a central stationary plate and forming with the zentral plate molding zones adapted to receive gypsum for the production of cored building blocks and means for holding the pivoted side plates from swinging inward toward the center plate.

7. In a machine for molding building blocks, the combination of a molding box comprising a stationary central plate, pivotal members mounted on the opposite sides of the stationary plate and adapted to swingv away from the central plate, and means for holding the pivotal members from swinging inwardly toward the central plate.

an end plat-e, a plurality of cores supported on the end plate and means for positioning the cores within the space between the Stationary plate and the pivotal plate.

Signed at Los Angeles, California, this 27 th day of December, 1923.

LESLIE R. COFFIN. 

